The US Navy’s electromagnetic railgun program represented one of the most ambitious weapons development efforts in modern naval history. Developed through parallel efforts by BAE Systems and General Atomics, the railgun promised to revolutionize naval combat by launching projectiles at hypersonic speeds without using explosive propellants.
How It Works
Unlike conventional guns that use chemical explosives, the electromagnetic railgun uses massive pulses of electricity to propel projectiles. Magnetic fields created by high electrical currents accelerate a sliding metal conductor between two rails, launching projectiles at speeds of 4,500 to 5,600 mph—that’s Mach 6 to Mach 7.
The weapon fires using electricity generated by the ship’s power plant, which is stored in capacitors and released in powerful bursts. This eliminates the need for gunpowder or other chemical propellants, simplifying logistics and reducing the danger of storing explosives aboard ship.
Record-Breaking Achievements
The Navy’s Office of Naval Research achieved several major milestones during the program’s development:
In January 2008, the Navy demonstrated the world’s most powerful electromagnetic railgun at 10 megajoules, firing at the Naval Surface Warfare Center in Dahlgren, Virginia.
In December 2010, the Navy set a new world record with a 33-megajoule shot. This achievement meant the Navy could theoretically fire projectiles at least 110 nautical miles, placing sailors and Marines at a safe standoff distance from threats.
In February 2012, engineers fired the Navy’s first industry-built prototype at the Dahlgren test facility, marking an important step toward a deployable weapon system.
The Competing Designs
The Navy pursued development through two industry teams—General Atomics and BAE Systems—to reduce program risk and foster innovation. Both companies delivered prototype launchers capable of firing at 32 megajoules, equivalent to the energy of 35 tons traveling at 100 mph.
General Atomics developed the Advanced Containment Launcher, designed to deliver significantly higher muzzle energies in a tactically relevant configuration.
Technical Challenges
Despite the impressive test results, the railgun faced severe technical hurdles. The extreme forces and temperatures involved caused rapid barrel degradation. The immense electrical power requirements—enough to power a small town—posed integration challenges for existing ships.
These problems proved difficult to overcome. After spending more than $500 million over a decade of development, the US Navy officially canceled the railgun program in 2021.
The Technology Lives On
While the Navy’s railgun program ended, the research wasn’t entirely wasted. The high-velocity projectile developed for the railgun can be fired from conventional naval guns, providing some of the range benefits without requiring the electromagnetic launcher.
Interestingly, Japan has successfully tested railgun technology aboard naval vessels, achieving speeds of Mach 6.5. This has prompted questions about whether the US Navy might revisit the technology or collaborate with international partners.
The railgun demonstrated that electricity-driven weaponry is technically feasible and could reshape future naval combat—if the engineering challenges can be solved.
